GEV's

2 posts ยท Nov 30 1999 to Dec 4 1999

From: Roger Books <books@m...>

Date: Tue, 30 Nov 1999 15:51:32 -0500 (EST)

Subject: GEV's

I'm a little confused.

I'm going to assume American/English units here instead of metric
as I am more comfortable with that. Also, the "," comma is a seperator, not a
decimal point.

Our GEV tank masses 80 tons or 160,000lbs.

Just a guess but the skirt would cover 8ft by 12 ft at a minimum. 96 square
feet or 13,824 square inches, which gives me 11.57 psi. I don't see that as
being terribly difficult to generate with a closed skirt. Is that an incorrect
assumption?

From: Oerjan Ohlson <oerjan.ohlson@t...>

Date: Sat, 4 Dec 1999 02:32:50 +0100

Subject: Re: GEV's

> Roger Books wrote:

> I'm a little confused.

Sounds a bit high, but OK. The Challenger II is about 138000 lbs, and that's
the heaviest MBT in use today.

> Just a guess but the skirt would cover 8ft by 12 ft at a minimum.

This is *extremely* small for that heavy a vehicle - solid armour
plate, or ten meters high, or something like that. Triple it for an MBT.

> 96 square feet or 13,824 square inches, which gives me 11.57 psi.

Judging from the mass and size of modern hovercraft, they have cushion
pressures between 0.25 and 0.8 psi. It seems likely that we have overlooked
something <g>

The skirt isn't completely closed - unless you assume an airtight seal
(powerfield?) between the skirt and the ground, you always get leaks. And...
as I've said in several previous posts, the 0.8 psi pressure hovercraft have
problems with noise and dust, but that'd be nothing
compared to what the  11+ psi craft would suffer.

Regards,